A Digimon that has this card in its digivolution cards attacks, and a security check was performed on my opponent's security stack. If the attacking Digimon with this card in its digivolution cards digivolves into a Digimon with <Security A. +1> using this card's inherited effect, is another security check performed?

I use a Digimon that has this card in its digivolution cards to perform a security check on my opponent's security stack, then I use this Digimon's inherited effect to digivolve into BT21-024 [Cyberdramon]. What card is trashed by BT21-024 [Cyberdramon]'s [When Digivolving] effect at such times?